Cannot control Hue Play lamps

This is still with deCONZ version 2.05.79?

I think the lines are not shown because the “Neighbor Links” button in the toolbar isn’t enabled.

I wonder if this could be a routing issue, when you select the greyed out node and press 0 (zero key) does it blink blue?

It makes no difference if the Neighbor links is pressed or not.
But no they do not blink blue when selected and pressing 0.
What exactly am I doing when I pres 0 ?